Technical
X-Pac VX21
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Needle

PrimarySchmetz Jeans 90/14
AlternativeSchmetz Microtex Sharp 90/14

Thread

  • Gütermann Mara 70 or Mara 50 (high-tenacity polyester)

Machine Settings

Singer Heavy Duty 4452
Stitch length3.0–3.5 mm
Stitch width0 (straight stitch)
Tension4–4.5
Presser footTeflon foot essential — standard foot will stick and drag

Quick Tips

  • Every needle hole is permanent. Plan seam lines carefully before sewing
  • Use clips only; no pins
  • Seam tape on the inside makes seams weather-resistant and hides needle holes
  • The X grid is a visual guide. Align seams parallel to the grid for a clean look

Detail

X-Pac is a laminate of a face fabric, X-grid scrim, and a waterproof film backer. It's the go-to for MYOG packs, pouches, and bivy covers. The laminate doesn't fray, holds its shape, and resists water. But every needle hole punctures the waterproof layer; seam sealer or tape matters on waterproof builds. A Teflon foot is non-negotiable. The film backer grips a standard foot and causes uneven feeding and skipped stitches. VX21 is the most common weight for pack panels and pouches.